EP0239959A2 - Procédé de transmission d'une information analogique et/ou numérique en particulier avec insertion d'un, de deux ou de plusieurs postes de liaison dans des installations de télécommunication - Google Patents

Procédé de transmission d'une information analogique et/ou numérique en particulier avec insertion d'un, de deux ou de plusieurs postes de liaison dans des installations de télécommunication Download PDF

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Publication number
EP0239959A2
EP0239959A2 EP87104623A EP87104623A EP0239959A2 EP 0239959 A2 EP0239959 A2 EP 0239959A2 EP 87104623 A EP87104623 A EP 87104623A EP 87104623 A EP87104623 A EP 87104623A EP 0239959 A2 EP0239959 A2 EP 0239959A2
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EP
European Patent Office
Prior art keywords
coding
frequency
transmission
alternating current
khz
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Granted
Application number
EP87104623A
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German (de)
English (en)
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EP0239959B1 (fr
EP0239959A3 (en
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Josef Dirr
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Individual
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Individual
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Publication date
Priority claimed from DE19863610761 external-priority patent/DE3610761A1/de
Priority claimed from DE19863629706 external-priority patent/DE3629706A1/de
Priority claimed from DE19873702202 external-priority patent/DE3702202A1/de
Application filed by Individual filed Critical Individual
Priority to AT87104623T priority Critical patent/ATE90169T1/de
Publication of EP0239959A2 publication Critical patent/EP0239959A2/fr
Publication of EP0239959A3 publication Critical patent/EP0239959A3/de
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Publication of EP0239959B1 publication Critical patent/EP0239959B1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/36—Repeater circuits
    • H04B3/38—Repeater circuits for signals in two different frequency ranges transmitted in opposite directions over the same transmission path

Definitions

  • the present invention relates to a method for the transmission of analog and / or digital information, in particular with the interposition of one, two or more exchanges in telecommunications systems.
  • the feedback circuits represent a major transmission problem in the transmission of information via connection paths, in particular long connection paths with exchanges (VSten) and amplifiers.
  • connection paths in particular long connection paths with exchanges (VSten) and amplifiers.
  • VSten exchanges
  • the ideal condition would of course be a 4-wire connection from the calling to the called subscriber.
  • the local exchanges OVSt are always 2-wire.
  • a switch to 4-wire operation would not be possible for economic reasons.
  • the object of the present invention is to present a method in which the feedback circuits are attenuated considerably more than in the previous circuits and in which the local exchanges can be operated in their 2-wire version like a quasi-4 wire path. This is achieved by the teaching disclosed in claim 1.
  • the invention shows how, independently of the connecting line, the input volume of the speech is transmitted to the called subscriber according to the volume.
  • the evaluation in the outgoing direction for example in the subscriber circuit, must be carried out independently of the attenuation of the connecting line. This can be done in different ways. Attenuators can be individually assigned to each connection line, or central elements, such as connection sets, changeable attenuators that are set depending on the line attenuation of the respective subscriber, or you can also carry out a value adjustment by comparing the individual connection line by comparison.
  • the switching can also take place with the multiplexers and switching matrixes and the hierarchical levels such as those used in the EWSD and S 12 systems. Since in the present invention a quasi 4-wire operation is already carried out by the subscriber is provided, the connection groups are essentially different. The connection is always quasi-4-wire.
  • the subscriber count takes place during the conversation with 16 KHz pulses. Of course, this affects the quality of the transmission very much.
  • the participant is transferred the registration number in a vate manner. The fee is then recorded at the subscriber himself.
  • the zone can be transmitted by the exchange, or can be determined from the subscriber himself from the code.
  • FIG. 1 shows the transmission structure of a PCM switching system.
  • High demands are placed on the forks G1 / G2 and on the replicas N1 / N2 so that the backflows R1 / R2 can be kept as small as possible.
  • One speech path goes via the fork G1, via the filter Fi, the analog / digital encoder A / D via the digital switch dig, then on the receiving side to the decoder D / A and via the filter Fi and the fork G2 to a final switch, the opposite direction is built exactly like this.
  • Fig. 2 shows the transition phases of a connection network from 2-Dr. mixed operation to pure 4-Dr. operation as shown in Figs. 2a to 2f.
  • FIG. 5 shows an arrangement according to the invention.
  • a coding alternating current of 64 KHz is provided on the transmitting side and 72 KHz on the receiving side. It is a binary digital code.
  • the principle is shown in Fig. 9. First, this is explained in more detail.
  • binary code elements as shown in FIGS. 9a, 9b and 9c (1.0) are formed from the half-waves or periods which are transmitted in an uninterrupted sequence of positive and negative half-waves.
  • Ig in F. 9d is a code from half-waves and in FIG. 9e) one from the periods.
  • the decisive factor is the uninterrupted sequence.
  • 9c shows an AMI code with a half-sine shape and zero. Of course, this gives a much broader frequency band than in Fig.9d / e.
  • the band in FIG. 9b becomes even wider when rectangular pulses are used.
  • the characteristic states are a large and a small amplitude value.
  • 72 KHz uses the period as a code element. With a tap of 8 KHz and 8 bit code for the pulse amplitude a code alternating current of 64 KHz is required and with a tap of 9 KHz and 8 bit code for the pulse amplitude of 72 KHz.
  • the switching matrix K in the local exchange OVSt is electromechanical, that is to say permeable to the frequencies of the coding alternating current. If the subscriber T2 is called in local traffic, the reception frequency for this is 64KHa and the transmission frequency 72KHZ.
  • connection is connected to the time division multiplexer Mu via an extension line VL, the filter Fi, the time switching stage ZK.
  • the extension cable VL is intended to match the different lengths of connecting cables.
  • the different lengths of the VL are checked in the example by the Reg register. In this the length is the resistance value of each connection line is saved.
  • M an can also do this by means of a measurement, for example by the subscriber sending the selection criteria at a certain level and measuring them in the register or individually in the outgoing remote dialing transmission.
  • the filter Fi is a mechanical filter that has a large edge steepness as shown in FIG. 3.
  • ZK is a time coupler stage that arranges the multiplexer in time, in this case it transfers the binary characteristic states. In this one can also proceed according to FIG. 23 by using a limiter B to control an electronic switch which then rectifies the coding alternating current according to the principle of coherent demodulation. The respective amplitude value can then be stored in a capacitor. The negative half wave is not required.
  • the capacitor With the next positive half-wave, the capacitor is again charged to the next amplitude value, similar to the capacitor C in FIG. 27. Because the capacitor with the value of the amplitude remains charged during a feriode, here in the example here, it is the time multiplexer Mu leave when the tap takes place, ie all connections in one direction can optionally be connected to the time multiplexer, regardless of which phase the coding alternating current has at the subscriber.
  • the connections to the multiplexer are of course permanently switched on, but connection changes can be made as desired, so the coding AC current does not have to be synchronized from the register. If you want to control the charge of the capacitor exactly, you have to proceed as shown in Fig. 28.
  • the coding alternating current corresponds to that shown in FIG.
  • FIG. 8a in which the period is provided as a code element.
  • the negative half-wave is always suppressed by this coding alternating current.
  • An alternating current of the same frequency is shown in FIG. 28b, but is out of phase by 90 degrees.
  • This alternating current is a limiter according to the Fig.23, H, fed so as in the F ig.28c shown pulses occur.
  • Each pulse begins with the amplitude value of the positive half-waves of the coding alternating current.
  • Mi + an electronic switch then becomes the respective one Amplitude value briefly connected to the capacitor.
  • Such an electronic self-holding device can be represented by a field-effect transistor, such as one designated in FIG. 27 with FET.
  • the coding alternating current of 640 KHz is generated in generator G. Once it is supplied to the electronic switch eS via the resistor R1 and once to the electronic switch it is also supplied via the resistor B2. The switch eS thus switches circuits with different resistances to output A, ie the half-waves or periods are of different sizes.
  • the switch eS is controlled by a code with the aid of synchronization pulses J, which are generated in the limiter B by the same alternating current.
  • the 64 KHz and the 72 KHz coding alternating current are generated at the subscriber. Both directions can be transmitted 2-wire via fixed conductors.
  • the FiQ filters for 640 and 720 KHz separate both directions.
  • the 720 KHz coding alternating current goes via the FiQ filter to the DMu demultiplexer.
  • Each of the 10 channels is assigned the respective code element in the form of a small or large voltage pulse. These pulses are pressed onto the periods of the 72 kHz alternating current in the encoder CY.
  • a mechanical filter Fi for 72 kHz then passes through the coupler K to the subscriber T1.
  • the control takes place via the register Reg and the control of the other switching centers via a control line StLtg. If you take the half-wave as a code element, only frequencies of 32 or 36 KHz required for the alternating coding currents.
  • the FiQ filters can then also be replaced by mechanical ones.
  • the frequency of the coding alternating current can also be reduced according to the method of FIG. 8. 8a, the coding alternating current is 8 kHz and the code element the period.
  • pulse amplitude modulation can also be used.
  • the principle is shown in FIG. 14.
  • F ig.14a a Schwingungszmg is recorded with the sampling P1 to P8.
  • the samples are taken either bipolar according to Fig.25 or unipolar according to the circuit of Fig.26.
  • Fig. 14a the sampling is shown unipolar.
  • a sampling circuit is recorded in Fig. 27.
  • the values of the samples are now either applied to the periods of an alternating current with the tap frequency, here 8 KHz, that is to say an encoding alternating current of 8 KHz, or to the positive and negative half-waves of an encoding alternating current with the frequency 4 KHz.
  • the tap frequency here 8 KHz
  • FIG. 14b shows an 8 KHz coding alternating current. Either the positive and the negative half cycle then take the same amplitude value, so the sampling P1, the positive half wave aP1 and the negative half wave aP1, the sample gather P2 half waves aP2 / aP2, etc.
  • the half-wave is provided as a code element in the coding alternating current.
  • the sampling P1 is pressed onto the half-wave aP1, the sampling P2 from the half-wave aP2, etc.
  • FIG. 14 an analog transfer of the sampling to the amplitudes of the half-waves of the coding alternating current is carried out.
  • frequency division can be performed. Four division etc.
  • the coding alternating currents are lower by the fourth part than the repetition frequency of the taps. That is why they are 90 degrees out of phase with each other. So is the tap frequency 8 KHz resp. 4x2 KHz with a mutual phase shift of 90 degrees, the coding alternating currents have a frequency of 2 KHz with a mutual phase shift of 9Q degrees.
  • a coding alternating current of 4 KH is required. If two coding alternating currents offset by 180 degrees are used, the frequency is 2x2 KHz. If one of these C b alternating currents is phase-shifted by 90 degrees and then both are added, the entire message can be transmitted with an alternating current of 2 KHz.
  • RAM coding you get, for example, the following options for frequencies, namely for sending or receiving: 8 KHz / 12 KHz, 4KHz / 6 KIz, 2 KHz / 3KHz You can also vary these frequencies, e.g. 8 KHz with 3KHz etc.
  • the subscriber must then, for example, switch to coding with the traffic exemption number 0.
  • frequency-appropriate filters must be provided. The greater the distance between the two directions, the more economically the filters can be used.
  • a channel for the transmission of control and selection criteria can also be provided, which is expediently controlled from the register.
  • FIG. 6 shows a circuit for the use of the invention in existing TF systems.
  • 7 shows the previous structure of the input stage of a TF system.
  • F2an is the sending direction of the voice channel.
  • the speech in the frequency range from 300 Hz to 3.4 kHz is fed to the channel modulator KM and in parallel the signals at 3.85 kHz kHz.
  • the carrier and the upper side band are screened out in the channel filter KF.
  • the side bands are then fed to the pre-group modulator VM together with the channels 2 + 3, etc.
  • Incoming, the channels K1 to K3 are screened out in the filter VF and fed to the pre-group modulator VM.
  • the KF filters separate the individual channels.
  • the incoming voice signals then reach the fork via F2ab via the modulator KM, an amplifier, and a low pass.
  • the control signals reach remote dialing via a separate route S2ab.
  • the local traffic takes place in the area of the voice band.
  • the voice alternating currents are supplied to the analog / pulse amplitude modulation converter A / PAM via the exchange with the switching matrix K to the amplitude limiter A and the low pass TF.
  • the speech signals are converted into a code alternating current 2 + 2 in this.
  • the samples are first transferred to the half-waves of two coding alternating currents that are 180 degrees out of phase. As a result, one of them is phase-shifted by 90 degrees.
  • Both are then added and transmitted as an alternating current at the frequency of 2 KHz, respectively. fed to a decoupler E.
  • the signals with 3.85 KHz and 2 data channels with 3 and 1 KHz are also connected to these.
  • the sidebands then reach the higher levels of the TF system via the channel modulator KM and the channel filter KF.
  • the TF mixture is fed to a filter Fi by separating the 1, 2, 3 and 3.85KHz alternating currents.
  • the voice code alternating current 2 + 2 is converted in the PAM-2 + 2 / PAM 4 converter into a coding alternating current of 4 KHz, and fed to the subscriber T1 via the coupling arrangement K.
  • a backflow in the direction of transmission is prevented by the low pass TP.
  • the participant has an evaluation device that converts the coding alternating current into the voice alternating currents.
  • an evaluation device that converts the coding alternating current into the voice alternating currents.
  • 4 KHz coding alternating currents electronic switching fields can be used. If there are electromechanical ones, a coding alternating current of 6 KHz can also be provided, for example.
  • a second voice channel can be switched via the same TF channel.
  • a circuit for this is shown in FIG.
  • the coding alternating current 2 + 2 remains as before.
  • the connection to the analog / PAM converter 3 + 3PAM is then routed via another output of the switching matrix K and fed to a channel modulator via a decoupler.
  • S1 and S2 are the signal wires for both channels, in the example 3.85 KHz for one and 1 KHz for the other channel.
  • the alternating currents of 3.85, 3.2 and 1 KHz are separated in filter Fi and once fed to a converter 2 + 2/4, which converts the addition alternating current from 2 KHz into a code alternating current of 4 KHz and transmits it to the subscriber, and the other time the 3 +3 ; KHz alternating current converted into a code alternating current of 4 KHz, and transmitted to the calling party.
  • FIGS. 19 and 20 show two examples.
  • the carrier spacing is 1 KHz.
  • the channels 12, 13, ... 25 KHz are assigned to the channels 1, 2, 3, ... 14. If the lower band and the carrier are filtered out, after the modulation at an encoding alternating current fN of 4 KHz, the sidebands are obtained. Frequencies from 16, 17, 18, ... KHz.
  • the F ig.20 channels 1 to 12 divided in 3 groups of four and assigned to the carriers 25, 26,27 and 28 KHz.
  • the coding alternating current fN is 8 KHz. If the carrier and the lower side frequency are filtered out, a group has the frequencies 33, 34, 35 and 35 KH z.
  • Regenerators can be used with pulse code modulated signals just like with other codes.
  • pulse-amplitude-modulated alternating currents according to FIGS. 14b, c, this is also possible if a channel is provided as a comparison channel with a constant amplitude, so that amplitude fluctuations can be transmitted analogously to the useful channels.
  • the coding alternating current is transmitted on the basis of the frequency modulation.
  • the various channels are combined to form a coding alternating current, as already described in FIG. 5, fed to a frequency modulator and passed on to the line via a filter. Sending and receiving can take place over one line, the operation can also be carried out with 4 wires.
  • the frequency-modulated coding alternating current can be modulated onto the transmission alternating current on the basis of single-sideband modulation. Since the information is only determined by the size of the amplitudes, that is to say independently of the frequency, a significantly narrower band is also required for frequency modulation, as can be seen from FIG. 13.
  • Mf is the modulation oscillation once with the amplitude u and then with the amplitude 2u
  • M2f is a modulation oscillation with the amplitude 2u and the frequency 2f.
  • the period T / 2 is the smallest for the modulation oscillation with double amplitude and double frequency. Since only the amplitude changes in the present case, the bandwidth of the frequency-modulated carrier is consequently considerably smaller than in the case of an additional change in frequency.
  • In the F ig.12 is a connection from the OVSt1 to OVSt2. If the subscriber T1 calls the subscriber T3, a connection is established via the switching matrix arrangement K of the OVSt1 via the devices on the transmitting side S1, 2-wire via the long-distance route via the receiving devices E1, the switching matrix arrangement K of the OVSt2 to the subscriber T3. The direction of T3 goes via S2, the 2-wire long-distance line, then via E2 to subscriber T1.
  • Direct connections go here from the end switching center EV to the node switching center KV and from there to the main switching center HV and from there to the central switching center.
  • Regenerators which are not shown, may of course be required in the long-distance routes. These can be arranged in 2 or 4 wires, depending on what is more economical in each case. If sufficient bundles are required from the EV to the ZV, a direct bundle will be switched. If both locally separated by great distances, so you can eg R maybe fung make a 4-drähtige leadership. In the case of coaxial cables and fiber optics, the economic efficiency decides whether you choose 2- or 4-wire. In addition, remote switching FV can be provided if this results in better line utilization. Depending on the coding, the exchanges can even be equipped with electronic switching fields with 100% availability. Lun at Fernvermitt- g s come electromechanical Koppfelfelddr into account based on the information frets development (bandwidth).
  • the type of coding is very favorable for the ISDN network.
  • 17 shows terminal devices for telephony Fe, for image transmission Bi, possibly image telephony and for data transmission D.
  • the multiplexer Mu is provided for the combination of the code elements and the demultiplexer DMu for the distribution. Since the coding is fixed in the amplitude size of the half-waves, the multiplexer can detect digital as well as PAM-coded signals. It is assumed that a total coding alternating current of 64KHz is specified on the transmission side. This can now be expanded in language,
  • Image and data eg for speech, could be used when using half-waves as code elements and with a binary digital code (Fig.9d) 32 KHz, the remaining 32 KHz would then be left for image + data. If you were to provide the remaining 32KHz for image or data, you would have 64 Kbit available for image transmission.
  • Fig.9d binary digital code
  • an image of 2.5 x 2.5 cm is suitable for the viewing distance of the telephone user, with about 3600 image elements sufficiently wobbling to require a new image every second. This shows that 32 Kbit is sufficient for image transmission in telephony and that you can use it to display larger images.
  • FIG. 30 when the two alternating currents of FIGS. 30a and 30b phase-shifted by 90 degrees are added, an alternating current of the same frequency as shown in FIG. 30c is produced.
  • a reference angle is required, which can be determined, for example, by briefly sending one of the two alternating currents of FIGS. 30a or 30b. Such evaluations are known.
  • the addition of two coding alternating currents of the same frequency can of course also during transmission via. Pipelines are pre-go, such as in F ig.5 2 multiplexer and demultiplexer, the same is true for the 11 shows. The interconnection would have to take place in front of the frequency modulator and the evaluation or reception.
  • the phase change can be evaluated with reference phase or also by evaluating the change per code word. Differenzph a se done. The generation of such a phase change is shown in FIG.
  • the coding alternating current is generated in the Osc and distributed in two circuits.
  • a phase shifter Ph of 90 degrees is provided in the one circuit.
  • resistors which are switched on or off depending on the C ' or Cod, depending on the desired phase change. Both circuits are then brought together again in the adder and the total alternating current is fed to the line.
  • the phase position of the total alternating current is, ie a change in resistance in one or both circuits also causes a change in the phase position of the total alternating current.
  • the resistors are operated by electronic switches that are controlled from the encoder. eS1 to esn or es11 to 11n are the electronic switches and Wi1 to Win respectively. Wi11 to Wi 11n the associated resistors. So that the phase change only takes place at the zero crossing, the total alternating current is branched off and fed to a limiter B, in which pulses Js are generated, with which the encoder Cod is then only controlled when the total alternating current passes zero.
  • 16 shows a coding change current for a binary code with the half-waves as code elements and the characteristic states large and small amplitude.
  • the period will be chosen as the code element. Companding with the PCM is not absolutely necessary since a signal-to-noise ratio of 65 dB has also been achieved with 11 code elements with binary coding. Regenerators can also be used in the present codings, the same also applies to frequency modulation, since in the present case a very narrow frequency band is required. With analog coding on Amplitude Ba + sid you can use a comparison channel, amplitude fluctuations are then compensated for in the useful channels.
  • a subscriber circuit is shown in FIG.
  • the 2-wire, quasi-4-wire subscriber line Tln goes through a protective circuit Sch and via switch contacts SK, which are provided for the ringing current and for test purposes to the transmitter Ü.
  • the power is supplied via the choke SpDr from the monitoring ÜW.
  • the line leads once to the switching matrix K and in parallel to the register Rg.
  • the selection is controlled and evaluated from the register.
  • the multi-frequency touch dialing method is the most widely used today. Then there is a method according to patent DE 29 15 452, in which the number of periods of an alternating current, e.g.
  • FIG. 31 An excerpt from a subscriber circuit is shown in FIG. 31, in which the switching devices, namely the output stages, are time-multiplexed.
  • the hierarchy levels of the EWSD and the S12 system can also be used here.
  • a 64 KHz alternating code current is sent by the subscriber, corresponding to FIG. 5. This is fed to a rectifier via a filter Fi and converted into direct current pulses analogously to FIG. 32 with the aid of a limiter.
  • time-multiplexed tapping a large or small voltage is then tapped.
  • F ig.32 half-waves are represented as binary code elements which have been rectified and veranbeitet in the limiter to pulses.
  • Stereo sound lines can also be switched on the principle of this invention, possibly. then several channels must be provided for this purpose.
  • a section of such a connection can also go by radio.
  • FIG. 34 Such an arrangement is shown in FIG. 34.
  • concentrators for L + R and L-R - the coding is done with sinusoidal alternating currents - samples are taken and fed to a converter PAM / Cod.
  • the code alternating current from L-R is phase-shifted by 90 degrees, both alternating currents are then added in Ad and fed to the modulator M via a decoupler E.
  • a second coding shown in broken lines, is provided with a different code alternating current.
  • This double program DPr is fed to the same modulator via an adder Ad and the decoupler E.
  • a filter element is then arranged after the modulator, which filters out the carrier and the upper or lower side frequencies. The process is described in more detail in patent application DE P 36 29 706.2.
  • FIGS. 36 and 37 can be provided.
  • the binary code element is marked by a predetermined number of periods of an alternating current and the change in the characteristic state by a change in the amplitude (A, A1).
  • the code element is obtained analogously by the number of periods and the following Coelement marked by a different amplitude. (A, A1). This code is described in more detail in patent application DE 36 29 706.2.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
EP87104623A 1986-03-29 1987-03-27 Procédé de transmission d'une information analogique et/ou numérique en particulier avec insertion d'un, de deux ou de plusieurs postes de liaison dans des installations de télécommunication Expired - Lifetime EP0239959B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104623T ATE90169T1 (de) 1986-03-29 1987-03-27 Verfahren fuer die uebertragung analoger und/oder digitaler information, insbesondere unter zwischenschaltung einer, 2er oder mehrerer vermittlungen in fernmeldeanlagen.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19863610761 DE3610761A1 (de) 1986-03-29 1986-03-29 Verfahren fuer die analoge oder digitale codierung von information fuer die verwendung bei winkel- und pulsmodulationsverfahren
DE3610761 1986-03-29
DE3629706 1986-09-01
DE19863629706 DE3629706A1 (de) 1986-09-01 1986-09-01 Verfahren fuer die codierung und uebertragung analoger information
DE3702202 1987-01-26
DE19873702202 DE3702202A1 (de) 1987-01-26 1987-01-26 Verfahren fuer die uebertragung analoger und/oder digitaler information, insbesondere unter zwischenschaltung einer, 2er oder mehrerer vermittlungen in fernmeldeanlagen

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EP0239959A2 true EP0239959A2 (fr) 1987-10-07
EP0239959A3 EP0239959A3 (en) 1989-05-24
EP0239959B1 EP0239959B1 (fr) 1993-06-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025026A1 (de) * 1989-12-07 1991-06-13 Dirr Josef Verfahren zur codierung von information

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081312A (en) * 1934-06-05 1937-05-25 American Telephone & Telegraph Carrier telegraph system
DE861579C (de) * 1942-05-20 1953-01-05 Siemens Ag Nachrichtenuebertragungssystem
DE3010938A1 (de) * 1980-03-21 1981-10-08 Josef Ing.(grad.) 8000 München Dirr Verfahren zur uebertragung einer vielzahl von kennzeichen mit einer frequenz eines wechselstromes, vorzugsweise fuer fernmeldeanlagen
DE3133397A1 (de) * 1981-08-24 1983-03-31 Josef Ing.(grad.) 8000 München Dirr Verfahren fuer das digitale bildfernsprechen
EP0110427A2 (fr) * 1982-12-07 1984-06-13 Josef Dirr Procédé pour la transmission d'informations selon lequel le codage des signaux s'effectue par la grandeur de l'amplitude des demi-ondes ou périodes d'un courant alternatif de forme sinusoidale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081312A (en) * 1934-06-05 1937-05-25 American Telephone & Telegraph Carrier telegraph system
DE861579C (de) * 1942-05-20 1953-01-05 Siemens Ag Nachrichtenuebertragungssystem
DE3010938A1 (de) * 1980-03-21 1981-10-08 Josef Ing.(grad.) 8000 München Dirr Verfahren zur uebertragung einer vielzahl von kennzeichen mit einer frequenz eines wechselstromes, vorzugsweise fuer fernmeldeanlagen
DE3133397A1 (de) * 1981-08-24 1983-03-31 Josef Ing.(grad.) 8000 München Dirr Verfahren fuer das digitale bildfernsprechen
EP0110427A2 (fr) * 1982-12-07 1984-06-13 Josef Dirr Procédé pour la transmission d'informations selon lequel le codage des signaux s'effectue par la grandeur de l'amplitude des demi-ondes ou périodes d'un courant alternatif de forme sinusoidale

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025026A1 (de) * 1989-12-07 1991-06-13 Dirr Josef Verfahren zur codierung von information

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DE3786032D1 (de) 1993-07-08
EP0239959B1 (fr) 1993-06-02
EP0239959A3 (en) 1989-05-24

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